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Analysis of continuous operation voltage of surge arrester
Date:2015-11-14 hit count:0
The continuous running voltage of the lightning arrester is basically and the maximum phase voltage, but for the neutral point not directly connected system, lightning arrester of continuous operating voltage but also than that of fault during the maximum relative rated power frequency voltage.
Because Zinc Oxide arrester without gap, so the power frequency voltage grid has been added to it, the continuing role of this voltage will make it possible to produce Zinc Oxide products aging, so in the test of arrester, when dangerous overvoltage has passed, with rated voltage transient overvoltage simulation in lightning arrester on time for 10 seconds (this time is determined by the circuit breaker is connected to the power grid in the operating time, and in the super high pressure systems, even taking into account the reserve protection action, no more than 1 seconds), this is not enough, because the operating voltage after the temporary overvoltage arrester also bear system, then with the maximum continuous operation to simulate the operating voltage of the phase voltage, the maximum operating system line voltage divided by the square root of 3, pressure for 30 minutes, then observe the temperature of lightning arrester Is the fall or continue to rise and cause a thermal collapse. So in a sense, the surge arrester rated voltage and sustained operating voltage in the test is of great significance in the operation of little significance, in order to illustrate this point, we look at a case. In the I.E.C standard and the national standard, the accelerated aging test to do lightning arrester, because Zinc Oxide arrester connected to the grid in the long term, continuously under the grid voltage, so the product may be aging, aging products in the actual power system is the natural aging, if we think uptime in the grid a lightning arrester for 100 years, if the use of natural aging methods, then we have to wait 100 years, this kind of waiting is stand for the development of any new product, so we must do the artificial accelerated aging test, namely in human factors, with a not long time (of course not too short) the product, accelerated aging, and then take this time to the equivalent of natural aging time. In lightning arrester of accelerated aging test, the first to add voltage, the voltage set to and continuous operating voltage and pressure time for 1000 hours (about 42 days), if the surface temperature of zinc oxide valve sheet has been able to remain in the range of 115 + 4 degrees C, think of the surge arrester in continuous operating voltage to run 100 years, this is the artificial accelerated aging effect, it is the artificial pressure time 1000 hours and natural pressure time 100 years together, is really improves the efficiency greatly, it can be said: no artificial accelerated aging almost without any electrical equipment. Of course, as to whether such equivalence, the country is still in the further study
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Add:Xiangyang Industrial Zone, Liushi, Wenzhou,P.R. China 
Contact Person:Candy zhao 
Tel:0086-577- 62600386 62602786
Fax:0086-577-62600796
P.C:325604
E-mail: xk@cnxiya.com
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